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Executive Summary

The 2006 Congestion Mitigation and Air Quality Improvement (CMAQ) Program Interim Guidance provides explicit guidelines to program effectiveness assessment and benchmarking by calling for a quantification of benefits, as well as disbenefits resulting from emission reduction strategies for project selection and evaluation[1]. More public agencies are attempting to measure the value of Transportation Demand Management (TDM) strategies relative to their potential benefits and costs in comparison to other transportation solutions commonly employed to address capacity needs.

Various tools, such as the Worksite Trip Reduction Model (WTRM) developed by the National Center for Transit Research, the Environmental Protection Agency (EPA) COMMUTER model, and impact calculation methods developed by the California Air Resources Board (CARB), are currently available for estimating some of the benefits of

several TDM and other emission reduction strategies. guidance exists to quantify the costs and benefits of TDM full range of benefits and costs accrued.

However, no

standardized

strategies that

considers the

The availability of an effective tool that takes into account a broader range of costs and benefits could greatly enhance agencies’ abilities to evaluate alternatives and estimate post-implementation benefits of TDM strategies. At the same time, poor estimates could steer traffic mitigation and emission reduction policies towards inefficient transportation investments at the local and regional level.

The objective of this project is to develop a standardized methodology for calculating the costs and benefits of TDM for comparative assessment and public decision making.

To achieve this goal, this report conceptualizes a new approach that builds on existing techniques and tools to produce a model that would save agencies time and money, providing a high level of reliability in impact estimates, while generating results that could be compared among regions and across projects.

A methodology that combines academic and practitioner experiences within a theoretical framework that truly captures what is at the core of TDM evaluation is herein detailed. That is, an approach that models consumers’ price responsiveness to diverse transportation options by embracing the most relevant trade-offs faced under income, mode cost and availability constraints.

The development of the theoretical model leads to the design and implementation of TRIMMS (Trip Reduction Impacts for Mobility Management Strategies), a practitioner

oriented

sketch

planning

tool.

TRIMMS

permits

program

managers

and

funding

agencies like dollars based

FDOT to make informed decisions on where to spend finite transportation on a full range of benefits and costs. The approach is consistent with other

benefit to significant

cost analyses. Its accuracy funds are at stake. The model

and the perceived fairness are allows some regions to use local

critical data or

when opt to

v

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